![](/images/graphics-bg.png)
Dwarf Galaxies in Voids : Dark Matter Halos and Gas Cooling
Joint Authors
Gottlöber, Stefan
Hoeft, Matthias
Source
Issue
Vol. 2010, Issue 2010 (31 Dec. 2010), pp.1-16, 16 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2010-03-31
Country of Publication
Egypt
No. of Pages
16
Main Subjects
Abstract EN
Galaxy surveys have shown that luminous galaxies are mainly distributed in large filaments and galaxy clusters.
The remaining large volumes are virtually devoid of luminous galaxies.
This is in concordance with the formation of the large-scale structure in the universe as derived from cosmological simulations.
However, the numerical results indicate that cosmological voids are abundantly populated with dark matter haloes which may in principle host dwarf galaxies.
Observational efforts have in contrast revealed that voids are apparently devoid of dwarf galaxies.
We investigate the formation of dwarf galaxies in voids by hydrodynamical cosmological simulations.
Due to the cosmic ultraviolet background radiation low-mass haloes show generally a reduced baryon fraction.
We determine the characteristic mass below which dwarf galaxies are baryon deficient.
We show that the circular velocity below which the accretion of baryons is suppressed is approximately 40 kms−1.
The suppressed baryon accretion is caused by the photo-heating due to the UV background.
We set up a spherical halo model and show that the effective equation of the state of the gas in the periphery of dwarf galaxies determines the characteristic mass.
This implies that any process which heats the gas around dwarf galaxies increases the characteristic mass and thus reduces the number of observable dwarf galaxies.
American Psychological Association (APA)
Hoeft, Matthias& Gottlöber, Stefan. 2010. Dwarf Galaxies in Voids : Dark Matter Halos and Gas Cooling. Advances in Astronomy،Vol. 2010, no. 2010, pp.1-16.
https://search.emarefa.net/detail/BIM-491147
Modern Language Association (MLA)
Hoeft, Matthias& Gottlöber, Stefan. Dwarf Galaxies in Voids : Dark Matter Halos and Gas Cooling. Advances in Astronomy No. 2010 (2010), pp.1-16.
https://search.emarefa.net/detail/BIM-491147
American Medical Association (AMA)
Hoeft, Matthias& Gottlöber, Stefan. Dwarf Galaxies in Voids : Dark Matter Halos and Gas Cooling. Advances in Astronomy. 2010. Vol. 2010, no. 2010, pp.1-16.
https://search.emarefa.net/detail/BIM-491147
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-491147